预报采用进退、横漂、首摇和横摇四个自由度的方程，考虑了横摇对水平面运动的耦合影响。
The mathematic model has four degrees of freedom (surge, sway. yaw and roll), taking the couple motion of roll on horizontal plane motion into account.
纵摇对横摇的非线性影响除以上参数外，还与漂心的纵向位置有关。
The nonlinear effects of heave on ship roll are also dependent on the longitudinal center of floatation besides above factors.
纵摇对横摇的非线性影响除以上参数外，还与漂心的纵向位置有关。
The nonlinear effects of heave on ship roll are also dependent on the longitudinal center of floatation besides above factors.
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